I was planning on attending one of those prenatal yoga classes but have no idea about training of instructor?

1 doctor weighed in

Prenatal stretching and yoga classes should be a safe activity for most pregnant women without physical disabilities, provided they are well supervised.

Non-contact, low impact sports and activities such as stationary bike, treadmill, walking and swimming are ideal during pregnancy to maintain muscle tone and keep the cardiovascular system in good shape in anticipation of labor and delivery.

In brief:
It's OK.

Prenatal stretching and yoga classes should be a safe activity for most pregnant women without physical disabilities, provided they are well supervised.

Non-contact, low impact sports and activities such as stationary bike, treadmill, walking and swimming are ideal during pregnancy to maintain muscle tone and keep the cardiovascular system in good shape in anticipation of labor and delivery.
Would you like to video or text chat with me?